iOS: bump build number

Change-Id: I5b853381f4fae47b20ff87284f4001b7719e3b74
diff --git a/Ring/Ring.xcodeproj/project.pbxproj b/Ring/Ring.xcodeproj/project.pbxproj
index 026a8b7..517f741 100644
--- a/Ring/Ring.xcodeproj/project.pbxproj
+++ b/Ring/Ring.xcodeproj/project.pbxproj
@@ -3214,7 +3214,7 @@
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 3;
+				CURRENT_PROJECT_VERSION = 4;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				DEVELOPMENT_TEAM = MSHYCBXK85;
 				"EXCLUDED_ARCHS[sdk=iphonesimulator*]" = arm64;
@@ -3254,7 +3254,7 @@
 				CODE_SIGN_IDENTITY = "iPhone Distribution";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Distribution";
 				CODE_SIGN_STYLE = Manual;
-				CURRENT_PROJECT_VERSION = 3;
+				CURRENT_PROJECT_VERSION = 4;
 				DEVELOPMENT_TEAM = "";
 				FRAMEWORK_SEARCH_PATHS = "$(inherited)";
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
@@ -3590,7 +3590,7 @@
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				CODE_SIGN_STYLE = Manual;
-				CURRENT_PROJECT_VERSION = 3;
+				CURRENT_PROJECT_VERSION = 4;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				DEVELOPMENT_TEAM = "";
 				FRAMEWORK_SEARCH_PATHS = "$(inherited)";